Clamp



G. w. HULSHIZER Jan. 19, 1932.

CLAMP Filed Aug. 22, 1929 INVENTOR. r IEHubhz eI ATTORNEY Patented Jan. 19, 1932 UNITED- STATES PATENT orrlca" m sswsnwm-msssawm lppuclfloll 1101 11M ,8, 19:9. ml I0. $87,866.

This invention relates to clamgs, but more particularly to a clamp adapte to be supported by a column or similar device and to itself form a support for a rockdrill.

1 One. object of the invention is to enable-the clamp to be quickly clamped to a supporting column or to be released therefrom.

Another object is to assure an ad uate pressure which may be readily applie for 10 clazllrliping the jaw elements of the clamp togeer.

Other objects will be in part obvious and in art pointed out hereinafter.

the drawin illustrating the invention 5. and in which similar reference characters refer to similar parts,

Figure 1 is a side elevation of a drilling apparatus equipped with a clamp constructed in accordance with the practice of the invention, and Figure 2 is a sectional transverse view through the clamp.

Referring to t e drawings, A. represents generally the clamp which is supported in this instance by an arm B of a drill column 0 interposed between the floor Dand the roof E of a mine or drift F.

The clamp A supports a shell G wherein is mounted a rock drill H carrying a worka ing implement, such as a drill steel J, for

drilling holes K in the material L.

In accordance with the present invention, the clamp A comprises a casing O, in one end of which is a cylinder P and at the other end an integral clamp portion Q preferably having an inner curved surface R of substantially the same conformation as the periphery of the arm B whereo'n'the clamp is mounted.

The curved surface R forms one side of a' a recess S in the casing O. and said recess has opposed. surfaces T and U which are tangent to the curved surface R and serve as bearing surfaces for theends of a. jaw V disposed slidably in the recess S.

Y threaded into the casing O to maintain the jaw in the casing 0 during such time as The jaw V is also provided with a curvedv surface W to .bear against the periphery of the arm B. In one side of the jaw V is a slot X into which projects the end of the key" may be drawn from the reservoir into the" the clamp may be detachedfrom the column arm.

Disposed in the cylinder P is a piston Z having a rod 6 attached thereto and'said rod 6 extends through a bore a in the casing I; and is adapted to abut the jaw V for movin said jaw relatively to the jaw rtion Any suitable closure may be provi ed for the o 11 end of the cylinder P, as for instance a p u uitable means are provided for compressing fluid, such as oil or water, and for pumping such fluid into the cylinder P for actuating the (piston Z and thus also the jawV. To

this en a chamber e is formed in the easingO and said chamber communicates with the cylinder P through a passa f. The casing O is further provided wit a supply reservoir 9 for oil or water if and said supply reservoir communicates with the chamber e through a assage 7'.

The means w ereby the fluid It may be drawn from the reservoir into the chamber 6 and compressed therein and pum (1 into the cylinder P may consist of a p unger I: having a stem owhich extends sli ably' through a sealing plug 1) in the outer end of the chamber a.

To the free or rojecting end of the stem 0 is pivoted a lin g which is pivoted at its other end to a lever r whereby the plunger 1: may be manually actuated. The lever 1' may be in the form of a bellcrank and one end thereof may be pivoted to the casing O as at s. In order to at all times maintain the lever r in the correct position' for pumping fluid from the chamber e into the cylinder P a spring t may be seated in the bottom of the chamber e to act against the nd'ofthephinger it.

Any suitable means, as for instance pressed ball valves u and 1), may be di p in the passages j and f respectively'for preventing the return of fluid fromthe chamber e into the reservoir 0 and also from'the cylinderPintothe cham re.

To the end that an adequate supply of fluid chamber a by the plunger kinany of the' various positions which a clamp of this cliard threaded into the end of the cylinder. U I

acter may assume in practice, a tube 10 is threaded into the casing to project into the reservoir 9, and said tube is provided with a plurality of ports a: through which the fluid may enter the tube. The fluid which the reservoir g is intended to accommodate may be introduced through an opening 3 normally sealed by a plug 2.

As will be observed the passages between the supply reservoir g and the cylinder P constitute a one-way channel between these elements. In order therefore to again permit the return of the fluid into the supply reservoir the casing O is provided with an exhaust passage 2 which leads directly from the cylinder-P to the reservoir 9 and is controlled by a throttle valve 3 disposed rotatably in the casing.

In order to clamp the casing O to the shell Gwhich it is adapted to support said casing is provided with an integral clamping member 4 having a conical surface 5 to conform to the surface of a cone 6 carried by the shell (x and a removable clamping member 7 having a conical surface 8 to bear on the cone 6 is adapted to bear with its other end against the jaw portion Q. The clamping member 7 may be clamped in position in any suitable manner, as for instance, by a bolt 9 threaded into the casing and having a nut lothreaded thereon to bear against the member 7.

In practice, whenever it is desired to fasten the clamp A on a column or arm, such as the arm B, the lever 7' may be manipulated for drawing liquid from the supply reservoir into the chamber e and also for compressing'such liquid and pumping it through the passage 7 into the cylinder P to act against the piston Z. Upon completion of a drill hole, after which it may be desirableto change the position of the drilling mechanism on the arm B, the throttle valve 3 ma be manipulated to release a portion or all 0 the fluid under pressure in the cylinder P and such fluid will then return in the reservoir through the passage 2.

I claim:

1. In a clamp, a casing having a jaw portion, a jaw slidable in the casing to cooperate with the jaw portion for securing said clamp to a support, pressure actuated means for actuating the jaw and the jaw portion with respectto each other, a chamber 1n the casing connected with the pressure actuated means, a plunger in the chamber for compressing fluid and for pumping such fluid to the pressure actuated means, and means for actuating the plunger.

2. In a clamp, a casing having a jaw portlon, a jaw in the casing, pressure responsive means in the casing associated with the jaw, a supply reservoir for fluid in the casing, a chamber in the casing, passages leading from the chamber to the supply reservoir and the pressure responsive means, means in the chamber for compressing fluid and for pumping such fluid into the pressure responsive means to actuate the jaw with re ect to the jaw portion, and means responsive to the pressure of fluid admitted into the pressure responsive means for preventing unintentional return flow of such fluid from the pressure responsive means into the reservoir.

3. In a clamp, a casing having a jaw portion, a jaw in the casing, pressure responsive means in the casing assoclated with the jaw, a suppl reservoir for fluid in the casin a cham er in the casing, passages lea ing from the chamber to the supply reservoir and the pressure responsive means, means in the chamber for com ressing fluid and for pumping such fluid into the pressure responsive means to actuate the jaw with respect to the jaw portion, valves responsive to the pressure of fluid admitted to the pressure responsive means for preventing the return flow of fluid from the pressure responsive means through the passages into the reservoir, an exhaust passage in the casing leading from the pressure responsive means, and a valve to control the exhaust passa e.

In testimony whereof I have signe this specification.

GEORGE W. HULSHIZER. 

